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Fix: don't use membarrier SHARED syscall command in liburcu-bp
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Wed, 6 Sep 2017 20:35:59 +0000 (16:35 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Wed, 6 Sep 2017 20:45:04 +0000 (16:45 -0400)
commitd4dae7fc4a6fcb4c88c65a2445ee1ddc7a8ac500
treec5fda863d198bfafecbd71be9c58d583733990b6tree | snapshot
parenta90fc0aa575c71e1e5fb4dc8adc1f2d9001e536dcommit | diff
Fix: don't use membarrier SHARED syscall command in liburcu-bp

One main user of liburcu-bp (lttng-ust) invokes synchronize_rcu()
repeatedly, without batching (does not use call_rcu).

Those delays introduced by sys_membarrier SHARED command significantly
impacts application startup time. Therefore, revert to not using the
membarrier SHARED command.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
urcu-bp.c diff | blob | blame | history
Userspace RCU (urcu) for Linux
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